Tension device for bag-tying machines.



J. JESSEN.

TENSION DEVICE FOR BAG TYING MACHINES.'

APPLncATloN FILED rzu.25.1916.

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TENSION DEVICE FUR BAG TYING MACHINES.

APPLICATION FILED ria. 25. 191s.

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UNIT SAS AE Fit@m JAMES JESSEN, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO HENRY OB. HARDING, 0F MINNEAPOLIS, MINNESOTA.

TENSION DEVICE FOR BAG-TYING MACHINES.

Application led February 25, 1916.

To all whom t may concern.'

Be it known that I, JAMES JnssnN, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in rTension Devices for Bag-Tying Machines, of which the following is a specification.

My invention relates to tension devices for bag tying machines, and has for its object to provide a tension device to be used in connection with a machine of the type disclosed in my copending application, Serial Number 21,020, Iiled April 13, 1915.

In the machine of the above identified application, means are provided for compacting and holding the compacted neck of the sack in a fixed definite position and for laying a cord from a supply in a plurality of loops about the compacted neck of the sack and forming a knot as the cord is laid, the cord-laying member comprising a tubular finger movable about the neck in a manner eccentric to the neck so that at one point in the laying of each loop the member may eX- ercise a pulling effect to draw the loops and knot tight, if the cord from the supply is restrained at such time. In the foregoing application, one means of restraining the cord to enable the looper to draw the loops tight is shown and described, and it is the object of my present invention to provide improved means for gripping or tensioning the cord from the supply to enable the looper to operate in the above indicated manner. It is also an object of my present invention to provide means whereby the time of operation of the cord gripping device may be regulated or adjusted relative to the time of movement of the loop. It is also an object of my invention to provide, in combination with the-cord gripping device, tensioning means which are continuously operative upon the cord from the supply, the gripping or restraining means being intermittently operative.

The full objects and advantages of my invention will appear in connection with the detailed description thereof and are particularly pointed out in the claims.

In the drawings, illustrating the application of my invention in one form,-

Figure 1 is a part sectional elevation through a portion of a bag tying machine showing the looper member in its position Specification of Letters Patent.

Patented Nov.. 2*?, 1911*?. Serial No. 80,388.

relative to the compacted sack mouth and the improved tensioning means above referred to. Fig. 2 is a part sectional elevation of a portion of the machine shown at right angles to the view in Fig. 1, illustrating the manner in which the cord passes from the supply through the tensioning device and to the cord layer. Fig. 3 is a plan view of some of the parts shown in Figs. 1 and 2 showing the path of the delivery end `of the cord laying member. Fig. 4 is a detail view showing the manner of securing adjustability of the time of operation of the cord gripping device.

As illustrated, the neck l0 of a sack is compacted against a tying bar l1 by means of a pusher 12 operated in a manner as described in the aforesaid application, but which forms no part of the present invention, and therefore is not described nor shown. A shearing and gripping device 13 holds the end of a cord 14 adjacent the tying head 11, and this cord passes through the tubular end 15 of a cord laying member 16 and also through a hollow spindle 17, to which member 16 is secured by an offset connection 18. The hollow spindle 17 is journaled inside of a frame support 22 and has thereon a bevel gear 19 which meshes with a bevel gear 20 on a shaft 21 by which the cord layer 16 is rotated. A s shown in Fig. 3, the path of the delivery end 15 of this cord layer is eccentric to the compacted sack mouth 10, from which it follows that said delivery end in each revolution will be caused to approach said sack mouth and recede therefrom. It is obvious that if the cord from the supply were gripped and held during the part of the movement in which the delivery end 15 is receding from the compacted neck 10, the edect would be to cause said cord to tighten and draw up the loop or loops already laid, in this way causing the knot to be drawn tight and hard.

The cord 14 passes from the hollow spindle 17 between a pair of tension disks 23, 24, being supported therebetween by pins 25 and 26 extending through apertures in disk 24 and securing disk 23 in Xed position to a stand 27 rigidly connected with a main frame member 28. From the tension member the cord passes between guide pins 29 to the spool 30 journaled for rotation on a spindle 31 in any convenient position on the frame of the machine. A bar 70 secured to vportion arms 71 pivoted on rod 72 overlies the cord 14 and rests upon the top of the body of cord on the spool 30. This bar thus resting by gravity has the effect of putting a friction upon the spool and preventing rotation of the spool and consequent more rapid unwinding of the cord than is required for supplying the knotting device.

The disk 24 is fast on a horizontal plunger rod 32 which extends through an aperture'33 in the stand 27 and through' journal screw 34 threaded into the end of aperture 33. A washer sleeve 35 surrounds and is slidable upon plunger rod 32 within aperture 33 and is held in engagement with disk 24 by a compression spring 36 surrounding plunger rod 32 and positioned between the end of washer 35 and the inner end of journal screw 34 in the aperture 33. The spring 36 thus presses the disk 24 against the cord 14 between disk 24 and disk 23 with a constant pressure the force of which may be adjusted as desired by turning the screw 34. This serves as a constant tensioning means for the cord as it passes to the cord-laying member 16.

The plunger rod 32 extends outside of the end of screw 34 in position to be engaged by a pusher 37 carried upon a head 38 integral with an arm 39 journaled at 40 to a fixed part of the machine and having an arm 41 provided with a cam roller 42 held in engagement with a rotary cam 43 by a spring 44. The pusher 37 has a shouldered portion 45 slidable within an aperture 46 in the head 38, said pusher being projected from the end of said head, and the portion 45 thereof being held in engagement with a complemental annular shoulder 47 forming a part of the head 38 by a strong spring 48 positioned in the aperture 46 between the 45, and the end of a screw 49 threaded into the aperture 46 by means of which the force of spring 48 may be regulated.

The rotary cam member designated generally as 43 comprises a pair of rings 50 and 51 secured for relative adjustment to a driven member 52 mounted upon a shaft 53 and driven by means, not shown, so as t0 rotate through a complete revolution while the cord laying member 16 makes a given number of revolutions sufficient to lay enough loops of cord to provide a tying knot for the neck 10. Upon ring 43 are located a plurality of Cam extensions 54, and ring 50 has a similar number of cam extensions 55. Cam extensions 54 and 55 are of the same height and the same shape and in one relative position of rings 51 and 50 the cam extensions 54 and 55 may be brought into juxtaposition. The ring 50 is shown as xedly secured to rotary member 52 by screws 56 while ring 51 is adjustably secured to rotary member 52 by screws 57 which extend through slots 58 in the ring 51. When the screws 57 are loosened the ring 51 may be positioned so as to make the aggregate cam surface produced by the coperative arrangement of cam extensions 54 and 55 either longer or shorter and similarly vary the point at which the roller 42will meet a cam extension relative to the position of the cord laying mouth 15 at the time the roller 42 engages said cam extension. vWhen the roller 42 rises on the camextension 54 it causes the pusher 37 to engage the end of plunger rod 32 thereby forcing the disk 24. against the cord 14 between disks 24 and 23 so as to add to the force of spring 36 that of spring 48, which is much larger vand more powerfulthan spring 36. This results in applying such gripping friction to the cord 14 as to practically hold said cord stationary,v and this will be done while the cordlaying mouth l5 is moving away from the neck 10. The cord, being thus gripped and held from forward feeding movement, will be subjected to tensioning strain, resulting in taking up slack-of the loop previously laid by the cord layer16 and drawing said loop tight and hard. The gripping tension to be applied can be regulated both by screw 34 and screw 49 and in practice will be sufficient to cause the proper tightening of the loops and knot, but not suiiicient to cause breakage of the cord 14. That is, the cord may be moved forward when gripped when thestrain on it approaches the breaking strain. A short pin-60 extends outwardly 'from the face of'disk 24 so as tokeep the cord from getting out of the tensioningA device. The pin 60 is adapted to enter an aperture 61 in disk 23 and has a beveled upper surface coperating with a cavity'in Vthe central portion of disk 23, which permits the cord readily to be threaded between the disks and the sets of pins 25, 26 and 60.

The advantages of my invention will be apparent. A suflicient yielding tension is applied to the cord at all times as it is fed through the cord layer and laid in loops about the sack. At the proper times additional pressure, through pusher 37 and spring 48, is applied, with the result that the cord is sufficiently gripped to cause eiiicient tightening of the loops andknot and yet so yieldingly that under all ordinary conditions of work the cord may move before breaking. Y

I claim:

1. In a machine for tying bags having means for holding the neck of a sack in compacted condition and means for laying a plurality of loops of cord about said compacted neck in such manner that the laying means is caused to approach and recede from the neck, a cord supply, means for applying continuous yielding pressure to the cord running from the supply to the looper, and means for periodically increasing said pressure to grip and hold the cord as the looper moves away from the compacted neck.

2. In a machine for tying bags having means for holding the neck of a sack in compacted condition and means for laying a plurality of loops of cord about said compacted neck in such manner that the laying sans is caused to approach and recede from the neck, a cord supply, means for applying continuous yielding pressure to the cord running from the supply to the looper, means for periodically increasing' said pressure to grip and hold the cord as the looper moves away from the compacted neck, and means for adjusting the time of action of the pressure increasing` means relative to the movement of the looper away from the compacted neck to regulate the tightening effect in accordance with the size of the sack being tied.

3. In a machine for tying bags having means for holding the neck of a sack in compacted position and means for laying a plurality of loops of cord about said compacted neck in such manner that the looper is caused to approach and recede from the neck, a cord supply, means for applying continuous yielding pressure to the cord running` from the supply to the looper, a rotary cam adapted to make one complete revolution while the looper lays a plurality or' loops about the neck, and having cam extensions having a deiinite relation in their position on the cam to the point of receding movement of the looper, and means controlled by the said cam extensions for periodically increasing the pressure on the cord.

4f. In a machine for tying bags having means for holding the neck of a sack in compacted position and means for laying a plurality of loops of cord about said compacted neck in such manner that the looper Copies of this patent may be obtained for ve cents each, by addressing is caused to approach and recede from the neck, a cord supply, means for applying continuous yielding pressure to the cord running from the supply to the looper, a r0- tary cam adapted to make one complete revolution while the looper lays a plurality of loops about the neck, and having cam eX- tensions having a definite relation in their position on the cam to the point oit' receding movement of the looper, means controlled by the said cam extensions for periodically increasing the pressure on the cord, and means for adjusting the position of the cam eX- tensions relative to the movement of the looper away from the compacted neck to regulate the tightening effect in accordance with the size of the sack being tied.

A tension device for bag tying machinos comprising a stand having an apen ture extending transversely through the same, a pivoted arm with a head having an aperture in substantial alinement with the first named aperture, a disk, a pair of pins rigidly securing said disk in spaced relation to the stand and forming a supporting guide for the cord, a second disk between the first named disk and the stand having a plunger rod extending through the stand aperture and outside of the stand, a spring in the aperture for yieldingly forcing the second disk against the oord between it and the iiXed disk to apply constant tension pressure to the cord, a pusher on the head in alinement with the end of the plunger rod, a spring in the head aperture engaging said pusher, and a cam for intermittently operating the arm to cause the pusher to engage the rod and add the force of the second spring to that of the irst spring to cause the cord to be gripped and held.

In testimony whereof I amx my signature in presence of two witnesses. Y

JAMES JESSEN.

Illitnesses:

F. A. VVHITELEY H. A. BowMAN.

the Commissioner of Patente,

Washington. D. E. 

